jpountz opened a new issue, #12956:
URL: https://github.com/apache/lucene/issues/12956

   ### Description
   
   #12895 highlighted that our backward compatibility tests could use some 
love. I reviewed what we have and tried to collect a list of things we should 
improve:
    - [ ] Add backward indexes created with `BEST_COMPRESSION`. Currently, all 
indexes we create use the default `BEST_SPEED`.
    - [ ] Restore write logic of old FST versions. #12908 added support for the 
last version back, but there are older versions we should add back as well so 
that we can test them properly through `BasePostingsFormatTestCase`.
    - [ ] Restore write logic of old BKDWriter versions. Likewise, but for BKD 
trees. Restoring them would allow us to test them through 
`BasePointsFormatTestCase`.
    - [x] Add tests with real data to `BasePostingsFormatTestCase`. (done via 
#12925)
    - [x] Add tests with real data to `BaseStoredFieldsFormatTestCase`. #12927


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